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Livro de Resumos

Characterization and control system of a magnetic field for tuning the Feshbach resonances in a Bose-Einstein condensate

P. L. Mazo, Kílvia Mayre Farias, Emmanuel Mercado Gutierrez, Vanderlei Salvador Bagnato, P. C. M. Castilho, P. G. Dias, Edwin Pedrozo-Peñafiel

Published Jan 1, 2016• 0 citations
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In this work we document the first measure of Feshbach resonances in our laboratory utilizing potassium 39 in the state F = 1, m F = 0. We submitted the 39K atoms trapped in an optical trap to a homogeneous magnetic field in the range of up to 800 Gauss, where are expected resonances for the species in the |F = 1 manifold.Those are the first steps to come up with a machine capable of using this technique for different and innovative studies on superfluidity in a mixture of quantum gases.In our case, we use the same pair of coils both to obtain different magnetic field gradients (phase of MOT and MT), in anti-Helmholtz configuration, as well as to obtain a homogeneous magnetic field (tuning the magnetic field around previewed resonance), in Helmholtz configuration.To make this possible, we have implemented a H-Bridge system, which consists in installing one of the coils in a system of power switches.We have prepared the atomic cloud since the MOT, passing through a Gray Molasses stage and reaching our Optical Dipole Trap with 10 6 atoms at 12 µK where we apply a homogeneous field and perform a loss spectroscopy.Here we will present the resonances we have obtained and its characterization.

•Dec 15, 2020•2 citations
The properties of Bose-Einstein condensed gases can be strongly altered by tuning the external magnetic field near a Feshbach resonance. Feshbach resonances affect elastic collisions and lead to the observed modification of the scattering length. However, as we report here, the observed rate of inelastic collisions was strongly enhanced in a sodium Bose-Einstein condensate when the scattering length was tuned to both larger or smaller values than the off-resonant value. These strong losses impose severe limitations for using Feshbach resonances to tune the properties of Bose-Einstein condensates.
We investigate controlled phase separation of a binary Bose-Einstein condensate in the proximity of a mixed-spin-channel Feshbach resonance in the $|F=1,{m}_{F}=+1\ensuremath{\rangle}$ and $|F=2,{m}_{F}=\ensuremath{-}1\ensuremath{\rangle}$ states of 87Rb^{87}\mathrm{Rb}87Rb at a magnetic field of 9.10 G. Phase separation occurs on the lower-magnetic-field side of the Feshbach resonance while the two components overlap on the higher-magnetic-field side. The Feshbach resonance curve of the scattering length is obtained from the shape of the atomic cloud by comparison with the numerical analysis of coupled Gross-Pitaevskii equations.
In this work we document the first measure of Feshbach resonances in our laboratory utilizing potassium 39 in the state F = 1, m F = 0. We submitted the 39K atoms trapped in an optical trap to a homogeneous magnetic field in the range of up to 800 Gauss, where are expected resonances for the species in the |F = 1 manifold.Those are the first steps to come up with a machine capable of using this technique for different and innovative studies on superfluidity in a mixture of quantum gases.In our case, we use the same pair of coils both to obtain different magnetic field gradients (phase of MOT and MT), in anti-Helmholtz configuration, as well as to obtain a homogeneous magnetic field (tuning the magnetic field around previewed resonance), in Helmholtz configuration.To make this possible, we have implemented a H-Bridge system, which consists in installing one of the coils in a system of power switches.We have prepared the atomic cloud since the MOT, passing through a Gray Molasses stage and reaching our Optical Dipole Trap with 10 6 atoms at 12 µK where we apply a homogeneous field and perform a loss spectroscopy.Here we will present the resonances we have obtained and its characterization.